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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d669caba645e1699c84a84c350edc329c4aa74efe762744e2e0c7f233378768' 
  AND token = 'ED10UTxQ9vBHtzBohUzMBUEKFDpr6leudWUoZaKUCxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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