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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e0ca437f7af926ce806267af44ef95aac824460f01b7bd250455fdeee569c0' 
  AND token = 'yZu5uJ+y9kplbwNYeY6XOHfvlEgp8eK38Ak20PQdaVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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