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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550cc82425a643e51c75d8d49640773ef2571c13ef794063cba5617796492dcf' 
  AND token = 'yh6kDUVEFsysRIQ03RG3eC48RYNBkXaPgcnDk0kuMSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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