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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7a713ce3a87e3250950a99ef432a4af9cb4929acc9fa090d8b8480097361ec' 
  AND token = 'cknJxgXGwMqH7gFr/T+v6cJGGSBR2iSjXywaOlltvGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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