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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ae47657b9dbf1f357ecc00f3a16af5cbfc3029827afc70517666efc5cf3ea0' 
  AND token = 'eUMaXHZ24ma/yKYtmisUspkRmFJlbl04awze/iyG5VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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