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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2024497d763d3ca41ee944567b860f6956cb937ce43ec0e1b6e5c2e974259b6a' 
  AND token = 'FIlyJPmh4GfN8NmKRyIWuSyTvSfQx2Y+rxyCrs2mpNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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