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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cb46a3e4963ceb8e4e3ad0828fa6c2d8bd678760f7861e4b8f38f7b8786515' 
  AND token = 'Tauhb/11vGTs31Ok+ew0oUWgg0OtF4R5CIJiH+MygsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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