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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914117ee50acc4b39d50ffc587c6d38b9b4fe0c7598ae7dcccf8733044a0924b' 
  AND token = 'nMfa4a3opb35BnZCHIomEVCc4gMk2vW6hG5+RSsllzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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