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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30adc94b2f3b83519f260e2798e34cad0ced97927ce52eca23082bb71d165e82' 
  AND token = 'lm9/3P/h+624K4VadeueJx3ge0jRC61yg5jKVbFDBKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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