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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30204a01d8be318c4e7031de36e4d1989266404e46fcf1a212cdf10ac50ae64' 
  AND token = 'UKFOSR8RKTHW63Csnf7STlHIhRMcAKH6H/RLPStGUPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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