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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b072762a5602698ab14852b082a91e2b1c7c91947437bb6370b81d2f21cfe7' 
  AND token = 'LV8UIDimf2Sj+0sQnNepdu/LVjCSzrrF/T6Nilwx8ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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