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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d17fba1f803224e3a4fcee0a0caa91856a14d2ae8e8318db3673142eae30f0d' 
  AND token = 'LE1ntqd4rR27nCZSdcDmr0wsym503ZKkTbMgJXsLaL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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