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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0709403ace62d755cef82d2bf76e71f7417eb7b2586ee0922096725c711da71' 
  AND token = 'ojKmOIjLLQ/q9QIwBln5fc8XvnuLHRIZeKP2UFUCo6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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