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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79d5e1453c939b494fac0e9f0354332781361c209e8cac6b9e8c506cd2c0398' 
  AND token = 'PDwFNgl5qStWAvZztwybDrbHSOzBZ843tjpLYzi1Kyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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