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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e609b2bdb8fd0b3459d767e401257532c340188d14b9d24babbf2714d9e097b7' 
  AND token = 'F32DPdCJ991cDJ/zbEhflZfg8pP9RzJLXDkSmBd1c4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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