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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569e53923ba7bfd87aa15c44ce337890527f0eeda3911b9e3ed77172d1b9fcfc' 
  AND token = 'gdg/YGJqwHjcBTKoUKeX/SIiMuJkofnfWTQt9TWbF9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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