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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2758714b31c3ba7ec63a6659af17853977203ac75c3fdd3cd6d56637447334ba' 
  AND token = '44x27RDAyUt2N8KksevVv3B31q9L/krZ/QpEOSK2+NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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