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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ade35524c2c811a9eb761395088571f1b7fdefbd1a623e0c0a944adf5dbbe24' 
  AND token = 'NiiPK/8/yW0+tN2XLblbK8JlMKVvDbX28sz1BdMDCxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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