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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9cdc7fcd61fa1cb0f70b51bcc87cb014d76774a7e839e3cbf8337ed3235f46' 
  AND token = 'mGET3WRnK6SdWwvZc4lZ8D8Ve9JDW2y1Oj+/byc9czo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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