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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978f0cc26326723e2adcf88dea9fbec8e01a42e082ed9b640b889955dc46f8a2' 
  AND token = 'mgtsxUHLyF8FNzxUQL0ZDNyDQO9bBnOoxHfxSM1UUaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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