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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2b96df568af3b4720acacecf013aab8384e81ed84e04971a63e0ed40c1a5d7' 
  AND token = '3vk3TSsfGb9TIJxYvc7GOxL+oWeU9LAD16OvOBK3J7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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