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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9014e1afe009d9f310492382bbd5c8a9e6824fede0445548a42e09709136d4f0' 
  AND token = 'GjvikYqXlN6Ydws6+NIpf0jLUW55U2zgS2YB7IVvNhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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