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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84690c2e2f05db301ff54c92d32dae3bbed00e69ccc6e077534de9e8f12b6cc' 
  AND token = 'Zs2cHcne6N9sSv6IxqUEu6clclqbpdrW6wINi3W56aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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