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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ac155e21e20f521b09ae0500476cd6a3dd5d1430fa38fc65c01de5fa3a89e5' 
  AND token = 'kJb2J27kLfF8GkL+fioCAUGxgft1aU9Y2E3EBAkAImM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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