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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4189c166ae4aed890f6c6c60a8bbb57c7baf0ebcd95380cafb0cb5d4f635b4' 
  AND token = 'kluKB3rA2sab2jQq9RwawlFFJtubrcgQSn5im9lykJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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