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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9c826ffdb236e8a90d52b2d6f79879a91744f2b81ac16d763e4cdd108ef09e' 
  AND token = 'dfnWnmA4J1v58fvnHqAh/po4nHGu7aL24wmkXn0OicA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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