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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f90ab0f30262e8f07bff6b2095257ef4ca5d07bc7faba2111d1514643f814f6' 
  AND token = 'rldjzYLN0hxHJWvDe5aWa1TeaK6ylEm6kru0/obN8zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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