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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679ef2d2dc7414ce0c44cc27afb5b6f1413990351e1d1e0d8c1e4a46adf7476f' 
  AND token = 's/NfhFQa24au1/vYPKf90PEBFIA6elql5FHOdoLqfHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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