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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef75255c94cb03db4e9fe22eab45de24db25298b192c55d3d966c5dda8cf335f' 
  AND token = 'CyfWFLo7iBPABn2HZU/K0xnXd1krnfWWlXshtcO16uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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