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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2eda4e8511921043fc0a051400eea7c6dde293377666e61efaafffb86a8c31e' 
  AND token = 'UnC0UpKDdXk7BubjzI949FkNLMoq358tp4PlzBVmo9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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