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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3fdf992d9dfcbaa2b2feacd97830bfec6479a8140d12cd140719f26f0755a2' 
  AND token = '09uf/m1oRIQDvluf7GWf85qhzV969IZHO+r0SlRgyrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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