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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2108025d95352b5e797c2f0f40b087ecd8151114cf82a4660ba25706f4b5dc3a' 
  AND token = 'LS9j6NjtFfZz6tYpY7xmU/ob7rC9HVEO5wyi/CE4LJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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