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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f72d1a7cc1e116a81391c850282183f8c425b6a7c123e8b2b7260a0dcaa5a84' 
  AND token = '32VhdXWDTkk/CfwJC895zTJPtUfDx5Cg06uMptHyfn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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