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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3b1342349f4b1c656a8c2f97ac656e1b7ca39556fcfd55f4ea34f42a73cee7' 
  AND token = 'MB58a+LvX66KX34+3cRM2xdTcC9e44q09LbTgHaAZL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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