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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6efefaa628cc342cc187ee57b8c2eefa0d2ae1e35104b9553d2b7aea9669ba' 
  AND token = 'dkq07Ct67BYOdq5nGhHx0aKk7HP1rgPPlZq8WvVkkrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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