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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ff76610138496d40e9bbaf01efdbfdf8e2327f5a4c9f3958546d03b5fb47587' 
  AND token = 'N8pinlM9pvQbIgHHdjjXL4U//p7SrSZpvkPnCN/yBi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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