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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13d5c5485dd659fd60a56d70460a64164a9452bc32e3757b24eafd50e3b52bb' 
  AND token = 'a5XYiiSVmeEjoJ688Ak8JaQ2ERmRiiXUKZ2S3VuC1b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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