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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42dd598a7a4e294f3b2ff7a3db60695f48dc6d23f2ff894d30082a9e92cd02b' 
  AND token = 'HKKHcL1U9PTkYJ1QPXaJErmtuLoR+6HZP5spS0tD1jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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