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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b5a2eb8f37c04eab0973c1cdd08ae06890f3631f800d76984cc9f4fa0718e5' 
  AND token = 'eLNG3DcQ+ZtUiLgxPG+MZzuTAaZdeiI0IwTG7kyWAWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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