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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58364cae2cb7075a2f1e473ddaa99322085409c39a103246f03b635835d2522f' 
  AND token = 'X+NrwKGo9CwTGz07SsfFvToUhp10vdE8wk/Ym7mf1SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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