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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1021cff8d712dae083e7f7e87dc20f0c87abcd86ddbcda8a8efc9771141a4c' 
  AND token = 'XXfVEsvhS7IDyB24feJwf7xEH36ONno7ATxUHS4vUNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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