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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f8e8fe28c12332704bbd999b31c9f6eb4f51ece9daae8ca07c523ca127658f' 
  AND token = 's3sC4jpykuvILs3mgaS1hsNP0GtdcuV1VlEVIv8QwCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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