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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b7d8232da18af45df7c7aad64d29df9cdb0995a014099e3005cba11df18e88' 
  AND token = 'cxZ7amk/j/HKugiWDWYYCAMsrn+MNbR08JCP2YwB42E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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