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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b526c380dc83955775cf21857506c232f0c2c0475a38ba09664dfae228dac5a9' 
  AND token = 'K5YMQwUO2Zot7U8Mb87sQ8Nxfnm/Ho3kK6U6JFr4ecw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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