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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79622778960b0710553925d782f6e5edf3d3671e87fff028cbf0e4f4724f212' 
  AND token = 'Pd/IOXLtQMkRo+fEGf/a68Gmy0eQFm7GxQUYZJSnY+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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