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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc81394f1da263f1043225c9589806e286302fa389728b8ef61adfeb9913a87' 
  AND token = 'X0m/ZBXtoPW10cLoGPl78jnqbCrv8fPLU88aKXOFTZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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