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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47838d43cc3d367d0c336bb78477de9b09de86164561a0f1c97eb66719410b5b' 
  AND token = 'rycrCZJXwyxKSiErK8YFtG3rr1BYQzw/8C9w9GrZtbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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