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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086e91404d7d1a2f4dea1dfd5258b75d6fc2d30540df147efea14e08c9e8ac8d' 
  AND token = 'n5YhOgCHJEg777YyIV0W3yce/iQwqRzp2B59ElbH/DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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