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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4caf5abafd7a95c2b0d0d88904d8aee8aaea7c1adfde0f2b0c038056e08c8d77' 
  AND token = '2VfyiTG8EC2K5FigKokfuJpPTwtzbkyw3jFkjvpUNTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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