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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7815abc924b578f549eae3ef5070e1c6a12852990e5e1282c69473a12a6f9a1c' 
  AND token = 'kKc7sMxDwzlE89XBpjz/+5cx5qYOfZ2f5gN5lSgzn34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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