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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c79dade49e24867a880f3e7739c860f9d4267db30b1df3b03a7aec506c8c1e' 
  AND token = 'iu1d0/CIVp9okWkSgPkLMeZAuUxfY3ZkWsqle5dw8Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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