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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe63d187a76098b828eb599f4216d25ae2fd0fae03707b2ab8aa3524af9f9c9' 
  AND token = 'dXQcVte6NxAAl7ORImml7m+7NYMVRk733Y5Q8gVpvZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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