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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd362a6dad2be540591a949258b12eb184dda1e5517481f4650a7ea7cc66aba2' 
  AND token = 'NfPXKcySeXe3NhDrb3Zg+cys0zr+5toz1Kg275KKOiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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