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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96e70723be1500c1520acb3ac33f360fffc04c5428a7a31b7a002546b520143' 
  AND token = 'oakWCufn19HNPnzA7KMzyXYNqBfDilbnnclqOXIO0iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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