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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101d5a6ecd7f0d63a5756683d7e683f416b2aff23453cedcaa278ecb96b5e769' 
  AND token = '2hbyLByqho+gNnoUZtJJdrS7AlVB6KDJtk33JTKLVh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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