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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d521d777f651f120c09a8fb29e68192d97129208f9d928e8019de3cef65541a' 
  AND token = 'lftyWDd73u7/y83SIPVXD6blEVGO+PUPNDpi5FMToac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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