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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a39b3b53bb0c7ac12316efa212db685bb39b594da63a52b18b23ed62ce0bda' 
  AND token = 'eDYfzLIiZoF7JoCJu3FSPnKw7tda+5v0ULX09yrKa1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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