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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f6073363921cdbe84210e18141375c1bf3441b622158eb1ec739944216d609' 
  AND token = '6sCiAjDpLv1r4j4qNRPujeA37yTXeZ7lDq3L2kxOlBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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