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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a01c214823fad72f0fe8092e0cd61a4984cc64924e39279896a94f7f87de43' 
  AND token = 'eb27hZswjxMq/LtqKQRc5Xz8wyaX7gbr85cG3AFaZfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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