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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ab578ea40fce9195bb37a4d675b1db3b2ae776331183c8c53088bf72c8f525' 
  AND token = 'A4fLysq26MMWIZkLSec5J/jFOtaC71Ijmyyo5+4LGPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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