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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5ef227d99f64fe34a92614703526c51766cfc103603c5c02cca3cae7f432e8' 
  AND token = 'ic3/XXd+rMwc9PXuYZ6qK0OwmjwofpiLru8RdKYLge8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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