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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2ae3c48c1af43d497efb5728b14eefb4f799c683a51d71185a7913791b47e5' 
  AND token = 'gDHA4LwRRJlYokSsne7E63+n6JSgFPcGs9FUzUN8I6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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