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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea229e0aaff7d52486fae11dc52b24d8320f9a3dad496b895ce8287dc798d99' 
  AND token = 'FvIPsXQ94JLcIdI5tLJjpgqkAQiD3rL23lMoxplHZgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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