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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d910753d95bdb72aff9ccfa523bd21e78d37ed33aee23b7d3d9300d846e7ee' 
  AND token = 'Er7HR2py0Qf4i/H5/nwl7DGJf5JGLKJG+M10NdAAEnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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