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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec160ef93858e69910de8328e12b5054d486c194d947c5be763e5bbf6cfe3d6' 
  AND token = '4LSrgfU1U1FfddVwcyKVUpEBtnTxXufrI7WzVaNrxjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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