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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a810564cb5fc138edfbd7ed13c6898e0d3eb14e0309fa0ba1aa87440076012c5' 
  AND token = 'aDsVclOljgB7CgIb94I4Z0QyLXzILsSIg5F0IDl5sso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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