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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8bea6c63e5cf8bb56e97cb0bc0720f8cb3c19054d20547f06c3519007db40f' 
  AND token = 'T4si5w+d0MmsPmRVQaDpBBG3471sdmPUg3X8AxKCDnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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