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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9961ec54d53a14d98f004625dd7c2b92c193ef4e3edd97b1ac55b6fdbf24bd7' 
  AND token = 'yA8EYZ7Og+cNDRzXRy7eapJMyyu6I70e+ZdKv7EypfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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