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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7dc5cd8ede40e8b13bd4bad79a4b82f39f80f74173a4be16e9ba5742661a18' 
  AND token = '3iBiincNUtvqzNHDHwbjccHAqr/ghTsEnHdY4VA5cus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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