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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30116743f8c4801e2dbe3d467b873783061e5d2f2b32641e4ca0d37cb1820a9d' 
  AND token = 'P3ndfr2KLpnxVTPNPwTPG48V8vztYGJRJM77C1x4OHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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