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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7dbf7657193d0586494170a690c152b3eba6aee71afcd6f657c05f4a6616c7' 
  AND token = 'Vc/16Akk9p/VxuOCZJ/8CPFY/T+dgAJ5LmGa9Q/Dn9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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