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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcd7c0f129457823d9e6f91839d44f7cfb6ab593f28cc3855447690f8fa7e77' 
  AND token = 'KACe21lPjxTz1U88hs9SseZL0iWM/rtvbnMA6fqku7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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