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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec25c4e220412f188fdd9235c4ad3e84fdfd5a4e48591698c57d6e4e9dab717' 
  AND token = 'gqCWOv80SzznjfXD67f6ptfw12WSCgt2LhYhBrjl+xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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