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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e92c9256255939038005bae47cf9e0b201efe85d8a7f12852e2b1c219d0efe' 
  AND token = 'l6qDcMip//mEujHqDo2zQ8NDb9HK2lkSzAkF5Fr+f/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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