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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16291e02ace3509ab9cde12208460214247ea6e2d8dbddebbec697d8a565c88e' 
  AND token = 'YrygWJOX0vHX2UfufKef0qWHNGZ7fJXlRzANUt2m4oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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