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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbf795a5abac44fcbe634f8513be21bf15280a5731c8938f523daf0bb646c09' 
  AND token = '+c90FZvF6hET6IREXwjvcN2Bav2T1Ww5m3Zxp6FT5BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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