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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb845d22ed6ae1ee6ed61e62ecea9771e99469e20d840111c17e9fc1107aa03' 
  AND token = '+kdqi6ytw3W1oju61JhZr3puwTg6PMU7QY4tJosKWaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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