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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87d1af696c589bf3ee394b855e4d91ed4a67c699b60167b226354657b93c0b2' 
  AND token = 'D9EC1eIhhx9svfCnmH3aWZgPS74OI04KX8a8oEIrbHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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