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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674d596ab1b4b7b8d099d733e748ea20c484471efef99b1431c8607c6adf4240' 
  AND token = 'NfblO6o+W88UOaDN5fGZbnj3VObd3LUeO0r/N/gPOu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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