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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1583cc6620e9ac0271a23e413f3bb69e863dc624714d26db018ba5eec9a7ce64' 
  AND token = 'N/zmx5FZyilnU9+EcxGBeGUoupti2zSCmhHF+3a9XZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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