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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba813366053bb5da71a18ce3a1d9c79af43073c3d1e3d0d4c9c0f93016bdaca' 
  AND token = 'doiRTJlQ76wkjLXuh+uiLbhxeCXdO9skv5xgEkCdTRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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