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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9264b26d4ea08d128e2b57e9f1909544b1f8ce225823de57ef6284864d833ce1' 
  AND token = 'OTO4wG0ja4ZyYNlMFmn8yCY+Xl3A0OMLu7rboIBxWLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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