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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56eacafdf643a3445bb04bee6f56056e5eec15dac203c7d72173e8ff86828eca' 
  AND token = 'H2goop9Gk6I8QtiJI8Ow/UymLJvyfibtut8oSovFTLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}