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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eeec090963810e432773815cfb33560d19032d8f1ac8c3d325384607582d980' 
  AND token = '3pO45xk637yxydh/3FjEiJCd8L2noO+Z0BCo5I3WP7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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