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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4773f4f9028325b0e5b41cb5ad1c1c9cdf8f9b7623c71678be9161debcfb1f4e' 
  AND token = 'BZdoLauyca5irvr0CiO2hcBSICcOFJN+NKaffvK1jVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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