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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfccfb36c368956afe296c7751c1ded25762c10f347223f2077a57fe6fe831ed' 
  AND token = '3B4r/d1mCd29awZ0vjVmUgNyTs0TCMJBuHhbzo3nDNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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