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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84ed7e038d13eaac5c617c65f0b8e2e130dfd12f36e23697eb91ea5c9229c4d' 
  AND token = 'E0D9sMK062HwpiXgJCQKgeKapXBolow0NbGI/z66gZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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