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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c98b1c193ba6c34681a16ffcf03ed1cd3671a1e1d16387ee6718c5de7318da' 
  AND token = '7Qf8IQfLtfohxQsW7eCfaPzMLgeDMe+12JBW3HWqA1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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