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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e49190e6b1cbb8ff02f719e331520ba06375bb4bc888bedd3a71a45adfc684e' 
  AND token = '3Viog+qGqqOPLIJLNFSsEoBf0xeeG+JG/9qmoNIUas0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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