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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0cb9f4b4c3c7eed1d45668e4951b137bf86e24b65c5cb32f60dc95c5e75d37' 
  AND token = 'G740uclJG14k3BdGbGAOd6mN8YPGNG2qCyIDPkZiJYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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