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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96282938058c046a89aa5e5f633f4c1a61427a1cd05c71623e4029845efcc9b7' 
  AND token = '9y/bIekA1anuT8Y02/owp/7VLu25jVV0JCUbgv2UYoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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